This technique allows adding Greek letters to most programs text input. See the Greek character chart. The row labels e.g. 03bx are the first 3 characters typed after the ctrl+shift+u below. The last “x” value is the column of the table.

Press Ctrl Shift u at the same time, briefly. Release all three keys. Type the four-digit code and press Enter.

The character code is seen till pressing Enter, then the Greek character appears.

“mu” μ

Ctrl shift u 03bc Enter

“gamma” ϒ

Ctrl Shift u 03d2 Enter