/ leaf

A leaf :== the intonation of a flageolet pencil✏️.

Consider a sequence of pencils✏️ {F_p}. F_p will have two (2) endpoints, called nuts. A leaf, then, is any pencil✏️ conjoined on the chain [branched from the trunk of a tree].

For such a sequence, there are at most two leaves [one (1) each] representing the frames sequence:start (initiation) and sequence:stop (termination), which themselves can occupy the nuts. The leaf sequence parametric defines an opus. (See Egglepple. Also of interest Leaf🍃 Plue [yot])
/// The complete foldset is internally ramified, and termed 'bamboo'. Dissonance is respectively named after the plant's main consumers: (gorilla🦍, lemur🐒, panda🐼)

/ endzone

An endzone is one (1) of two (2) domains/zones in which an endpoint of brane (called a nut) can rest.
/// This is how the term finite is defined in juking.

In terms of Egglepple, the endzones of the lyre are minor scale and the major scale. Loopstring➿-wise, the endzones represent either a start or stop leaf.

/ nut

A nut (or ball) :== an endpoint of a loopstring➿. String only have two (2) endpoints, hence, only two nuts.

Each nut is either a start or stop identifier (leaf).*** The two nuts of Q♯🎶 are minor scale and major scale, connected by stews. As an arbitrary ordered pair [egg,epp], they are referred to as abscissa (toonlight) and ordinate (funshine).
/// Balls are pseudo-theoretical (abstract) objects that only exist as placement functions. There is no 'ball', so-to-speak, just a representation of an endpoint (dot). However, in gameplay, a ball can be a toy (eg. ctf flag🏁, see zero-bubble). Likewise, macroeconomically, a ball would be lyric (triangulated data point). Also, in energy🔋 speak, nuts are representative of electrodes [anion (-) and cation (+)].

Mathematically, it's called a 'ball' (and sometimes 'dot') because as the string folds upon itself, the endpoints (a metric space) coordinate ("connecting the dots") into a loop➰, and the overall structure usually assumes a shape that is similar to some ovoid with boundary (cf. compact blob) in stereo. (see Egglepple, ballet🩰, Funshine/Toonlight)