The Christogram (or logo of Christ’s name) IHC is an alternative for IHS, and is often found in old churches in the UK.
It is a transliteration of the Greek iota-eta-sigma, with the sigma represented by a C rather than an S.
See the following examples:
Oxford,Trinity College, Dining Hall
Orchardleigh, St Mary
Earlham Cemetery, Norwich, Norfolk
Guy’s Chapel
Bury St Edmunds, Suffolk
Byz./Medieval Lady’s Christogram Silver ring on eBay
Cross at Grace Cathedral
Church dedication: St Mary The Virgin, Long Stratton, Norfolk
Church dedication: St Peter & St Paul, Lavenham, Suffolk
Church dedication: St Mary the Virgin, Burston, Norfolk
There are probably thousands of examples in English churches.
It’s very easy to see that this could be taken as standing for Jesus H. Christ.