There is a lettered system of grades:
P,S or T1/S2/S3
M1/M2/M4/M6 etc etc
...that are used across DTT but these just cause confusion across certain parts of the business.
In Consulting (but not those parts with a small C that are aprt of Corporate Finance)
M1 is Consultant
M2 Senior Consultant
M4 Manager
M5 Senior Manager
M6 Director
M68 Principal
A Partner