- rhif adnabod (“ID number”)
- rhif archeb (“requisition number, order number”)
- rhif cofrestru TAW (“VAT registration number”)
- rhif cofrestru (“registration number”)
- rhif cyd-drefnol (“co-ordination number”)
- rhif cyfatebol (“corresponding number”)
- rhif cyfeirnod cwsmer (“customer reference number”)
- rhif cyhoeddi (“issue number”)
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- rhif cymysg (“mixed number”)
- rhif degol (“decimal number”)
- rhif deuaidd (“binary number”)
- rhif deuol (“dual number”)
- rhifedd (“numeracy”)
- rhifedi (“number, numeral”)
- rhif ffôn symudol (“mobile phone number”)
- rhifiadol (“numerical”)
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- rhifogon (“arithmogon”)
- rhifol (“numeral; numerical”)
- rhifo (“to count, number, reckon”)
- rhif swyn (“magic number”)
- rhif sylfaenol (“radix”)
- rhif y blodau, rhif y graean, rhif y gwŷdd, rhif y gwenith, rhif y gwlith, rhif y sêr (“innumerable, countless”)
- rhifydd (“counter”)
- rhif yswiriant gwladol (“national insurance number”)
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