Vim What?Commandsb
b

The b command in Vim

Motion

prev word

Move backward [count] words. Stops at the start of each word. Punctuation counts as word boundaries.
Examples
Related plugin

bkad/CamelCaseMotion — Adds b / w / e to move by subword within CamelCase and snake_case identifiers.

Reference

Official Vim help for b

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