I read in writing explained.org that "schedule" can be abbreviated as Sched or Skd.
Can these abbreviations be used for "Scheduled"? (as in a task scheduled for 5.30pm)
Any suggestions for abbreviations for Scheduled will be greatly appreciated
Learn English – can the abbreviation for “Schedule” be used for “scheduled”
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They don't, because the word used is "senior", not "elder". ("Senior" is abbreviated "Sr.")
When referring to relatives, "elder" is most often used for siblings. In this context, its opposite is "younger". Since these are comparative terms rather than labels, there is not generally a need to abbreviate them.
Skill, as you mentioned is too short to be abbreviated and no abbreviations will make sense for the word. However, I've seen in many places, where an image that represents skills is used to convey the same meaning.
Best Answer
"Sched." could be used for scheduled. Almost any word can be abbreviated by shortening it, given sufficient context, but ask yourself is it really important to save those few letters.
Any form of abbreviation will harm readability. The word "scheduled" appears as part of a sentence. I can't see much benefit in writing (for example) "meeting sched. at 4:30". I wouldn't use the abbreviation as part of a paragraph.
I've never seen skd as an abbreviation, even though I pronounce the word as skedule. It would seem to be even less likely where shedule is the pronunciation.