The term "ms" is likely a typo or shorthand. It seems to refer to "Ms.," which is a title used before the name of a woman to indicate her marital status is either unknown or that she prefers not to disclose it. It is a neutral form, unlike "Miss" (which typically refers to unmarried women) and "Mrs." (which refers to married women).
The term "Ms." originates from the 20th century as a part of the feminist movement, aiming to provide a title for women that does not specify their marital status, thereby promoting equality.