Canon EOS R50 Advanced User's Manual page 229

Note
The images will be bracketed in the following sequence: 1. Standard white balance,
2. Blue (B) bias, and 3. Amber (A) bias, or 1. Standard white balance, 2. Magenta
(M) bias, and 3. Green (G) bias.
You can also set white balance correction and AEB together with white balance
bracketing. If you set AEB in combination with white balance bracketing, a total of
nine images will be recorded for a single shot.
The white balance icon blinks to indicate that white balance bracketing has been
set.
Bracket stands for bracketing.
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