This is the 557th most frequent Finnish word.
mm
"Mm." in Finnish is an abbreviation meaning "among others" or "including."
Here, 'mm.' is an abbreviation for 'muun muassa', which means 'among other things'. It indicates one example of several similar cases.
Hänen syntymäpäivänsä osui mm. keskelle viikkoa.
Their birthday fell, among other things, in the middle of the week.
In this usage, 'mm.' (muun muassa) highlights one topic out of several discussed at the conference.
Konferenssissa käsiteltiin mm. ympäristökysymyksiä.
The conference addressed, among other matters, environmental issues.
The abbreviation 'mm.' is used to introduce examples of topics covered in the book, without listing all possible topics.