What is the meaning of れ?

The hiragana syllable れ (re). Its equivalent in katakana is レ (re). It is the forty-second syllable in the gojūon order; its position is ら行え段 (ra-gyō e-dan, “row ra, section e”).

perfective/imperative of り (-ri)

continuative of れる (-reru)

the wind

five

nominalizing suffix used to form pronouns, often from demonstratives: one, thing

Source: wiktionary.org