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How is mosso played?
Read bare Mosso as a valid request for animated, moving character, not as an automatic numerical increase. With più, the local music becomes more moving and normally faster; with meno, it becomes less moving and normally slower. Those compounds are relative to the prevailing passage and do not name an absolute BPM. Composers use the family for graded changes of pace and energy within a movement, and the precise new tempo must be judged from metre, figuration, ensemble and what came before.
How does mosso sound?
The music gains or relaxes a sense of forward motion relative to its surroundings, an animation felt as a change in energy rather than a fixed new speed.
Mosso almost never appears by itself. It's the root of più mosso (more motion, faster) and meno mosso (less motion, slower), and both are defined purely against whatever tempo came immediately before — not against any absolute figure. No source I found gives mosso a number of its own, and I don't think one exists to find.
In context
Mosso is the past participle of Italian muovere, “to move.” Historical music dictionaries define the bare word as moved or animated and separately define più mosso as faster and meno mosso as less fast, so the common compounds must not erase the independent meaning of Mosso. The family belongs with other contextual controls such as sostenuto and a tempo, but each performs a different job: Mosso changes the degree of motion, while a tempo restores a prior pace. No stable general abbreviation passed the source threshold, so mosso should be written out.