I’ve put together, with Mrs Mac’s help, a document with quantity, symbol, unit and unit symbol so that you know the meaning of the terms in the Relationships Sheet. It is in EXCEL so that you can sort it by course, quantity or symbol.
Quantity, Symbol, Units the excel sheet
Quantity, Symbol, Units a pdf sheet sorted by course and then alphabetical by quantity.
This is the same information in readily available Tablepress form. If you click on the Higher tab at the top it should sort by terms that you need in alphabetical order, or search for a term. Let me know if I’ve missed any.
Quantity, Symbol, Unit, Unit, Symbol N5AH.
N  H  A  Physical Quantity  sym  Unit  Unit Abb. 

5  absorbed dose  D  gray  Gy  
5  absorbed dose rate  H (dot)  gray per second gray per hour gray per year  Gys^{ 1} Gyh ^{ 1} Gyy^{ 1}  
5  6  7  acceleration  a  metre per second per second  m s^{ 2} 
5  6  7  acceleration due to gravity  g  metre per second per second  m s ^{ 2} 
5  activity  A  becquerel  Bq  
5  6  7  amplitude  A  metre  m 
5  6  7  angle  θ  degree  ° 
5  6  7  area  A  square metre  m ^{ 2} 
5  6  7  average speed  v (bar)  metre per second  m s^{ 1} 
5  6  7  average velocity  v (bar)  metre per second  m s ^{ 1} 
5  6  7  change of speed  ∆v  metre per second  m s ^{ 1} 
5  6  7  change of velocity  ∆v  metre per second  m s^{ 1} 
5  count rate    counts per second (counts per minute)    
5  6  7  current  I  ampere  A 
5  6  7  displacement  s  metre  m 
5  6  7  distance  d  metre, light year  m , ly 
5  6  7  distance, depth, height  d or h  metre  m 
5  effective dose  H  sievert  Sv  
5  6  7  electric charge  Q  coulomb  C 
5  6  7  electric charge  Q or q  coulomb  C 
5  6  7  electric current  I  ampere  A 
5  6  7  energy  E  joule  J 
5  equivalent dose  H  sievert  Sv  
5  equivalent dose rate  H (dot)  sievert per second sievert per hour sievert per year  Svs ^{ 1} Svh^{ 1} Svy ^{ 1}  
5  6  7  final velocity  v  metre per second  m s^{ 1} 
5  6  7  force  F  newton  N 
5  6  7  force, tension, upthrust, thrust  F  newton  N 
5  6  7  frequency  f  hertz  Hz 
5  6  7  gravitational field strength  g  newton per kilogram  N kg^{ 1} 
5  6  7  gravitational potential energy  E_{ p}  joule  J 
5  halflife  t_{ 1/2}  second (minute, hour, day, year)  s  
5  6  heat energy  E_{h}  joule  J  
5  6  7  height, depth  h  metre  m 
5  6  7  initial speed  u  metre per second  m/s 
5  6  7  initial velocity  u  metre per second  m s^{ 1} 
5  6  7  kinetic energy  E_{k}  joule  J 
5  6  7  length  l  metre  m 
5  6  7  mass  m  kilogram  kg 
5  number of nuclei decaying  N      
5  6  7  period  T  second  s 
5  6  7  potential difference  V  volt  V 
5  6  7  potential energy  E_{p}  joule  J 
5  6  7  power  P  watt  W 
5  6  7  pressure  P or p  pascal  Pa 
5  radiation weighting factor  w_{R}      
5  6  7  radius  r  metre  m 
5  6  7  resistance  R  ohm  Ω 
5  6  7  specific heat capacity  c  joule per kilogram per degree Celsius  Jkg^{1} °C ^{1} 
5  6  specific latent heat  l  joule per kilogram  Jkg ^{1}  
5  6  7  speed of light in a vacuum  c  metre per second  m s ^{1} 
5  6  7  speed, final speed  v  metre per second  ms ^{1} 
5  6  7  speed, velocity, final velocity  v  metre per second  m s^{1} 
5  6  7  supply voltage  V_{s}  volt  V 
5  6  7  temperature  T  degree Celsius  °C 
5  6  7  temperature  T  kelvin  K 
5  6  7  time  t  second  s 
5  6  7  total resistance  R_{}  ohm  Ω 
5  6  7  voltage  V  volt  V 
5  6  7  voltage, potential difference  V  volt  V 
5  6  7  volume  V  cubic metre  m^{3} 
5  6  7  weight  W  newton  N 
5  6  7  work done  W or E_{ W}  joule  J 
7  angle  θ  radian  rad  
7  angular acceleration  a  radian per second per second  rad s ^{2}  
7  angular displacement  θ  radian  rad  
7  angular frequency  ω  radian per second  rad s ^{1}  
7  angular momentum  L  kilogram metre squared per second  kg m^{2} s ^{1}  
7  angular velocity, final angular velocity  ω  radian per second  rad s^{1}  
7  apparent brightness  b  Watts per square metre  Wm^{2}  
7  back emf  e  volt  V  
6  7  capacitance  C  farad  F  
7  capacitive reactance  X_{c}  ohm  W  
6  critical angle  θ_{c}  degree  °  
density  ρ  kilogram per cubic metre  kg m^{3}  
7  displacement  s or x or y  metre  m  
efficiency  η      
6  7  electric field strength  E  newton per coulomb volts per metre  N C ^{1} Vm ^{1} 

7  electrical potential  V  volt  V  
6  7  electromotive force (e.m.f)  E or ε  volt  V  
6  energy level  E _{1} , E _{2} , etc  joule  J  
feedback resistance  R_{f}  ohm  Ω  
focal length of a lens  f  metre  m  
6  frequency of source  f_{s}  hertz  Hz  
6  7  fringe separation  ∆x  metre  m  
6  7  grating to screen distance  D  metre  m  
7  gravitational potential  U or V  joule per kilogram  J kg^{1}  
halfvalue thickness  T_{1/2}  metre  m  
6  7  impulse  (∆p)  newton second kilogram metre per second  Ns kgms^{1} 

7  induced e.m.f.  E or ε  volt  V  
7  inductor reactance  X_{L}  ohm  W  
7  initial angular velocity  ω _{o}  radian per second  rad s^{1}  
input energy  E _{i}  joule  J  
input power  P_{i}  watt  W  
input voltage  V _{1} or V_{2}  volt  V  
input voltage  V_{ i}  volt  V  
6  internal resistance  r  ohm  Ω  
6  7  irradiance  I  watt per square metre  W m^{1}  
7  luminoscity  L  Watt  W  
7  magnetic induction  B  tesla  T  
7  moment of inertia  I  kilogram metre squared  kg m^{2}  
6  7  momentum  p  kilogram metre per second  kg m s^{1}  
6  number of photons per second per cross sectional area  N      
number of turns on primary coil  n _{p}      
number of turns on secondary coil  n _{s}      
6  observed wavelength  λ _{observed}  metre  m  
output energy  E _{o}  joule  J  
output power  P _{o}  watt  W  
output voltage  V _{o}  volt  V  
6  peak current  I_{peak}  ampere  A  
6  peak voltage  V_{ peak}  volt  V  
7  phase angle  Φ  radian  rad  
6  7  Planck’s constant  h  joule second  Js  
7  polarising angle (Brewster’s angle)  i _{p}  degree  ̊  
power (of a lens)  P  dioptre  D  
power gain  P_{gain }      
7  Power per unit area  Watts per square metre  Wm^{2}  
primary current  I _{p}  ampere  A  
primary voltage  V_{p}  volt  V  
7  radial acceleration  a_{r}  metre per second per second  m s^{2}  
6  redshift  z      
6  7  refractive index  n      
6  relativistic length  l'  metre  m  
6  relativistic time  t'  second  s  
rest mass  m_{o}  kilogram  kg  
6  rest wavelength  λ_{rest}  metre  m  
6  root mean square current  I _{rms}  ampere  A  
6  root mean square voltage  V_{rms}  volt  V  
7  rotational kinetic energy  E_{rot}  joule  J  
7  schwarzchild radius  r_{Schwarzchild}  metre  m  
secondary current  I_{s}  ampere  A  
secondary voltage  V_{s}  volt  V  
7  selfinductance  L  henry  H  
6  7  slit separation  d  metre  m  
7  tangential acceleration  a_{t}  metre per second per second  m s^{2}  
6  threshold frequency  f_{o}  hertz  Hz  
7  time constant  t  second  s  
7  torque  Τ  newton metre  Nm  
7  uncertainty in Energy  ∆E  joule  J  
7  uncertainty in momentum  ∆p^{x}  kilogram metre per second  kgms^{1}  
7  uncertainty in position  ∆x  metre  m  
7  uncertainty in time  ∆t  second  s  
6  velocity of observer  v_{o}  metre per second  m s^{1}  
6  velocity of source  v_{s}  metre per second  m s^{1}  
voltage gain        
voltage gain  A_{o} or V _{gain }      
5  6  7  wavelength  λ  metre  m 
6  work function  W  joule  J 