It's about the number of Vertebrae in a Snake's Body.
It's about the number of Sesame Seeds on a Big Mac bun.
It's about one-and-one-tenth times the number of Manned Flights to Space.
In other words, 350 is 1.120 times the count of a Manned Flights to Space, and the count of a Manned Flights to Space is 0.8930 times that amount.(2016 figures) (flights with at least 80km altitude; US, Russia, the Soviet Union, and China)
Since the flight of the Vostok 1 in April, 1961, there have been a total of 312 manned spaceflights under the American, Russian, Soviet, and Chinese space programs. Furthermore, the space programs of the US, Russia, the Soviet Union, France, Argentina, and Iran have launched a total 32 monkeys (specifically rhesus, cynomolgus, and squirrel monkeys, macaques, chimpanzees) into space.
It's about one-and-one-tenth times the number of Beatles Songs.
In other words, 350 is 1.130 times the count of Beatles Songs, and the count of Beatles Songs is 0.8850 times that amount.(a.k.a. The Beatles) (1958 thru 1996)
On a total of 58 albums, the Beatles recorded 309 songs during their performing career (with three of the songs released only on post-breakup Anthology albums after 1970). Of their catalog, a total of thirteen songs were number-one chart hits in both the US and the UK.
It's about one-and-one-fourth times the number of Professional Baseball Teams in the United States.
In other words, 350 is 1.270 times the count of Professional Baseball Teams in the United States, and the count of Professional Baseball Teams in the United States is 0.7870 times that amount.(2016 figures) (includes Major, Minor, and Independent Leagues)
It's about one-and-three-tenths times the number of Words in the Gettysburg Address.
In other words, 350 is 1.290 times the count of Words in the Gettysburg Address, and the count of Words in the Gettysburg Address is 0.7750 times that amount.(Bliss text)
It's about three-fourths the number of Olympic Gold Medals Won by the Soviet Union.
In other words, the count of Olympic Gold Medals Won by the Soviet Union is 1.350 times 350.(a.k.a. Union of Soviet Socialist Republics, a.k.a. USSR, a.k.a. Сою́з Сове́тских Социалисти́ческих Респу́блик, a.k.a. CCCP) (a.k.a. Olympic Games, a.k.a. Jeux olympiques) (Summer and Winter Games grand totals; excluding Russian Federation Medals) (1952 thru 1988 figures)