Symbol for UnitOfMeasure_ph should be pH

[turingtest37]

gistd:_UnitOfMeasure_ph
	a gist:UnitOfMeasure ;
	skos:altLabel "ph"^^xsd:string ;
	skos:prefLabel "ph"^^xsd:string ;
	gist:isMemberOf gistd:_UnitGroup_acidity ;
	.

should be

gistd:_UnitOfMeasure_ph
	skos:altLabel "pH"^^xsd:string ;
	skos:prefLabel "pH"^^xsd:string ;
.

There should also be a symbol "pH" but it conflicts with picoHenry.

[MichaelSullivanArchitect]

how come "pH" is missing a corresponding gist:symbol ?

[rjyounes]

Why do we have an alt label that's identical to the pref label?