Question: What does the "OFS_" prefix stand for?

[gerryqd]

Hi Sir,
You done a great job, and the code is quite clean too.
While I am quite confused about the "OFS_" prefix in below code, what does it stand for? Could you help to explain?
Thanks!

M0S/stm32f072.inc

Line 139 in fd877b2

 .equ    OFS_CURRENT_TASK    , 0x0000