Here's how it's usually presented:
* M is often placed between the names of a married couple, usually with the husband's name listed first. For example: John Smith M Mary Jones.
* Sometimes, a date is included next to the "M" to denote the date of the marriage. For example: John Smith M Mary Jones (1890).
* Occasionally, a plus sign (+) is used instead of "M" to signify marriage. For example: John Smith + Mary Jones.
It's important to note that the specific use of "m" or other symbols might vary slightly depending on the genealogy software or charting style being used.