| Subject | Welsh | English |
| comp., MS | Cerdyn Busnes | Business Card (A card-like layout on an Outlook Contact that provides the user with the look of a real world business card) |
| comp., MS | Cerdyn Busnes Electronig | Electronic Business Card (A card-like layout on an Outlook Contact that provides the user with the look of a real world business card) |
| comp., MS | cerdyn clyfar | smart card (A plastic (credit card–sized or smaller) device with an embedded microprocessor and a small amount of storage that is used, with an access code, to enable certificate-based authentication. Smart cards securely store certificates, public and private keys, passwords, and other types of personal information) |
| comp., MS | cerdyn credyd | credit card (A type of payment card where the supplier is paid by the card issuer. The card holder then pays the card issuer) |
| comp., MS | cerdyn fideo | video card (The electronic components that generate the video signal sent through a cable to a video display. The video adapter is usually located on the computer's main system board or on an expansion board, but it is sometimes built into the terminal) |
| comp., MS | cerdyn sain | sound card (A type of expansion board on PC-compatible computers that allows the playback and recording of sound, such as from a WAV or MIDI file or a music CD-ROM. Most PCs sold at retail include a sound card) |
| comp., MS | cerdyn SIM | SIM card (A smart card that stores a subscriber's personal identifier, billing information, and data) |
| comp., MS | cerdyn talu ymlaen llaw | prepaid card (A physical card that represents a specific value or amount of service for which the user has paid in advance) |
| comp., MS | cod dilysu cerdyn | card validation code (A code that credit card companies use to authorize credit card charges. For example, American Express uses a four-digit number on the front of the credit card, and Visa, MasterCard, and Discover use a three-digit number on the back) |
| comp., MS | Gwerth Gwirio Cerdyn | Card Verification Value (A code that credit card companies use to authorize credit card charges. For example, American Express uses a four-digit number on the front of the credit card, and Visa, MasterCard, and Discover use a three-digit number on the back) |