- Proper noun. A Babylonian deity, corresponding to the Semitic Baal.
- Proper noun. (Armenian mythology) evil giant ruler of Babylon, defeated by Hayk.
- Proper noun. A female given name.
- Noun. A measure of relative power, defined as log10(P 1/P 2), where P1 and P2 are the measured and reference power respectively. See also decibel.