From the Nabataean letter 𐢓 (m, “mim”), derived from the Phoenician letter 𐤌 (m, “mem”), from the Egyptian hieroglyph 𓈖. See also Classical Syriac ܡ (m, “mīm”), Hebrew מ (m, “mem”), Ancient Greek Μ (M), Latin M.
Practice speaking and memorizing "م" and many other words and sentences in Arabic.