pipify-lines converts consecutive lines into a single line separated by pipes.
Given this text:
one per day
Put point on "apple" and run pipify-lines three times. The result is:
apple | one per day | doctor | keeps away
This isn't shorter than the complete sentence, "An apple a day keeps the doctor away." So it's a silly example.
However, when naming a complex heading that covers multiple subjects, the pipify naming style succinctly conveys the gist, whereas sentences take multiple lines, resulting in an ugly, hard-to-read heading.
The pipify method is convenient because Org makes it easy to reorder a list of lines. Use e.g. <M-S-up> org-shiftmetaup.
Easily name headings by breaking up naming into three steps:
Brainstorm relevant terms, one per line
Reorder the lines
Skipping complete sentences saves effort.