Who knows two hundred two?
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During the exile of the Jewish People in Egypt, they refined and elevated 202 of the "sparks of holiness" that Hashem scattered throughout the world. This is alluded to by the Torah's expression (Ex. 12:38) that "a great mixture" (ערב רב, the last word of which equals 202) accompanied them out of Egypt.
(Cited in many Kabbalistic and Chassidic works. This article provides a source that traces it to the Arizal.)
In Chutz L'Aretz we do not eat Chometz for appx 202 hours each year.
8 days x 24 hours = 192 hours
We stop eating Chometz appx 9 actual hours (although it is based on Zemanios, for clarity in this answer I am basing it on actual hours) before Shekia
We do not start eating Chometz for close to an hour after Shekiya on Motzai Pesach
Total = 202 hours
This Mishna (Orlah 2:3) has different approaches, but for the purpose of this question:
If one part Orlah falls into 200 parts of heter, that 201st part becomes heter to the extent that a 202nd+ part is also nullified, so long as the plus part is 1/200th of a part or less. [one approach of the Tiferes Yisrael -see text above that this halacha applies to kilayim as well.]
[Alternatively: 1 part orla falls into 199 parts heter to make 200, then 1+ part of neta revai (defined here as 'orlah') or kilayim fall in, the latter 1+ of neta revai or kilayim combine with the heter to nullify the orla, and (acc. to R' Yehoshua that only needs a 199+:1 ratio, the 1 part orlah can combine with the heter to nullify the kilayim.]