| BOM | Byte Order Mark |
| Box tree | A tree of frames (boxes) that shows how objects are laid out on the screen. |
| CSS | Cascading Style Sheet |
| DO | WML element that enables the user to create an action. DO elements are mapped as items in a submenu. |
| DOM | Document Object Model |
| ECMA | European-based industry association that focuses on development of standards including Internet- related specifications |
| ECOM | EPOC Common Object Model |
| IMEI | International Mobile Equipment Identity Unique number given to every single mobile phone, typically found behind the battery. |
| MIME | Multi-Purpose Internet Mail Extensions |
| NP | Netscape Plug-in |
| NPN | Interface called by the plug-in to communicate with the browser |
| NPP | Interface called by the browser to perform operations on the plug-in |
| WML | Wireless Markup Language |
| XHTML | Extensible Hypertext Markup Language |