Merge conflict
Occurs when two branches have made conflicting changes to the same code and manual review is required.
M
Mnemonic
A mnemonic is typically a sequence of 12 or 24 randomly generated words used to create and recover a Bitcoin wallet
MuSig2
An improvement over the original MuSig protocol, MuSig2 is a cryptographic protocol for creating Schnorr-based multi-signatures in Bitcoin.