On the PT type connector which have Upper and lower case letters look out for the:

C,c
K,k
P,p
S,s
V,v
W,w
X,x
Z,z

The font used for each case look the same just a bit smaller.

When designing your cables have drafting highlight the lower case letters  (ex lower case letter with underscore)

Do not use  double lower case letter to denote single lower case letters as PT connector series uses double lettering.

Inform your technician about the lower case letters.