European Numbering System

More information needed. Where did you see this 'number'?

at the end eg:en36A or en14B

In some scientific groups the letter indicates which base is being used:

B = binary

T = (base 3 or tri-state)

O = octal (base 8)

D = decimal (base 10 that nearly everyone else uses)

H = hexadecimal (base 16)

If there are other letters it is probably something entirely different.