The spelling of the phrase "be calms" can be explained using the IPA phonetic transcription. "Be" is pronounced as /biː/, with a long "e" sound and a stressed syllable. "Calms" is pronounced as /kɑːmz/, with a "k" sound and a long "a" sound, followed by a voiced "m" and "z" sound. Altogether, "be calms" can be understood as a command to relax and remain tranquil, spelled in accordance with standard English pronunciation rules.