the symbol of unit
weight : conventionally W Kgm/(s^2) or newton
work : also W Kg(m^2)/(s^2) or joule
pressure: usually p Kg/((m^1)(s^2)) or pascal
momentum:also P Kgm/s
power: also P Kg(m^2)/(s^3) or watt
The same letter is used multiple times in different contexts.