Writing Systems of the World 8, Exercise 3: shape and system

Canadian syllabics: each consonant has a fixed base shape, and rotating it
marks the vowel (the consonant p is a chevron pointing up, down, left or
right). The shape of a symbol encodes the vowel, but nothing in the shape
describes how the consonant is produced.

Tengwar: the shapes correspond to distinctive features of the sounds. Most
letters have a stem and one or two bows; doubling the bow voices a stop,
raising the stem makes a fricative, shortening it makes a nasal (Tengwar
article). The shape of a symbol encodes how the sound is made.

Closer to "featural" (Chapter 1: symbols for sub-phonetic elements): Tengwar,
because its shapes track phonetic features. The Writing system article cites
Hangul as the main featural example and notes its status is disputed, so the
label depends on how strictly "features" is read.