nappula

Nappula is a Finnish noun meaning a button or small knob. It denotes a device that is pressed or manipulated to operate something, such as a push button on electronics, a small fastener on clothing, or a control on a device. The word is formed from the root nappi with the derivational suffix -ula, which signals a diminutive or generic instance of a button.

In usage, nappula covers both physical buttons and button-like controls. In technology and consumer electronics, it is common to refer to push-button switches as nappulat; in everyday speech, the word can also describe small decorative or functional buttons on garments, although nappi is more typical for clothing buttons. In the context of software and user interfaces, a control element that the user presses can be described as a nappula in some contexts, though regional variation exists and other terms such as näppäin or nappi may be preferred.

The noun appears in Finnish-language writing and media as a generic term for button-like elements. It is compatible with compound formations such as ohjausnappula (control button) or käynnistysnappula (start button), illustrating its productive role in technical vocabulary. While primarily a common noun, nappula can also appear in metaphorical or specialized uses to refer to small, trigger-like elements within systems or devices.