hrīḥ is the seed syllable of Amitābha and so represents the qualities of the Buddha of the western quarter: chiefly meditation and compassion. In Tibet it is also associated with Avalokiteśvara or Chenresig.
Read my essay on the seed syllable hrīḥ.
Other bījas: a | āḥ | dhīḥ | hūṃ | maiṃ | oṃ | tāṃ | traṃ | phaṭ | svāhā |
Examples

hrīḥ in
Tibetan Uchen

hrīḥ in
Tibetan Uchen
hrīḥ in
Lantsa
Lantsa
alternative
Chinese
immitation Seal Script
Picture of hrīḥ on a
Japanese cellphone strap.
Courtesy of solemn.still

This carving of hrīḥ in the Tibetan script on a piece of stone was bought in Sikkhim by a friend for another friend.