Using 5 Standard Emojis for Satisfaction Survey or any Likert Scale

Satisfaction surveys increasingly use emoticons, i.e. a sad frownie, neutral face and happy smiley. Some additionally use traffic-light color coding (red to green). Let’s asume there are good reasons in a scenario to use 5 instead of the usual 3 (or fewer) levels, much like in a classic Likert scale (which surveys by approval) or a semantic differential rating scale.

Is there a well tested (maybe even conventional or standardized) set of five emojis found in Unicode that

  1. aligns naturally (across languages and cultures) on a qualitative scale from sad to happy when used together (relative context) and
  2. has every symbol (across popular / OS-provided fonts and image sets) distinctive enough to be not misidentified when used alone (absolute context)?

I see that Emojiscore, for instance, uses ?, ?, ?, ?, ? (top to bottom). I would have chosen a slightly different set intuitively, e.g. ?, ☹️, ?, ☺️, ? (left to right). The linked Emojipedia articles show alternative renditions and a recent study examines how some of them are interpreted very differently.

Please note that mood surveys, like Facebook’s response additions to the Like button, are a slightly different topic: Readers select one out of a predefined set of categorical icons to represent their reaction, which usually cannot be put together on a linear scale.

Mood survey using emoticons

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