| English | Welsh |
| access number | rhif mynediad (A phone number that subscribers can dial to reach online services) |
| bank transit number | rhif trosglwyddo'r banc (A unique bank registration number that a bank uses to identify itself) |
| complex number | rhif cymhleth (A number in the form a + bi, where a and b are real numbers and i = sqrt(-1) , so that bi is imaginary unless b = 0) |
| in-country number format | fformat rhif yn y wlad (The string that is used to define how to create an in-country/region number to use when making calls from a dial plan) |
| in-country/region number format | fformat rhif yn y rhanbarth/gwlad (The string that is used to define how to create an in-country/region number to use when making calls from a dial plan) |
| international number format | fformat rhif rhyngwladol (The string that is used to define how to dial someone from outside of their country/region) |
| mobile phone number | rhif ffôn symudol (The phone number for a mobile phone) |
| Number of Queries report | adroddiad Nifer yr Ymholiadau (A Web analytics report that provides information on the number searches performed) |
| number sign | arwydd rhif (The character) |
| ordinal number | trefnolyn (A number whose form indicates position in an ordered sequence of items, such as first, third, or twentieth) |
| Permanent Account Number | Rhif Cyfrif Parhaol (A 10-character alphanumeric identifier issued by the Indian Income Tax Department to all taxable entities for taxation and identification purposes) |
| personal identification number | rhif adnabod personol (A unique and secret identification code similar to a password that is assigned to an authorized user and used to gain access to personal information or assets via an electronic device) |
| pilot number | rhif peilot (A telephone number that points to a hunt group and is the access number for calls that are routed to Unified Messaging servers) |
| port number | rhif porth (A number that identifies a certain Internet application. For example, the default port number for the WWW service is 80) |
| serial number | rhif cyfresol (A number assigned to a specific inventory item to identify it and differentiate it from similar items with the same item number) |
| subscriber access number | rhif mynediad y tanysgrifiwr (A number that is configured in a Private Branch eXchange (PBX) that allows a subscriber to access their Microsoft Exchange mailbox over the telephone) |
| version number | rhif fersiwn (A number assigned by a software developer to identify a particular program at a particular stage, before and after public release. Successive public releases of a program are assigned increasingly higher numbers. Version numbers usually include decimal fractions. Major changes are usually marked by a change in the whole number, whereas for minor changes only the number after the decimal point increases) |
| week number | rhif yr wythnos (The weeks of the year are assigned a number from 1 to 52, called week numbers. When you turn on week numbers, they appear on the left side of the Date Navigator in Calendar) |
