Bech32
Bech32 is a segwit address format specified by BIP 0173. While this address format has been included in some implementations, as of December 2017, the address format is not recommended for use until more software supports the format.
See Also
- Talk by Pieter Wuille the new bech32 address format (March 2017) https://www.reddit.com/r/Bitcoin/comments/62fydd/pieter_wuille_lecture_on_new_bech32_address_format/
- Comment by maaku7 explaining how bech32 addresses improve the security of (for example) multisignature https://www.reddit.com/r/Bitcoin/comments/74tonn/bech32_native_segwit_address_already_used_on_the/dqlogru/