The Collaborative International Dictionary of English v.0.48:

Pictograph \Pic"to*graph\, n. [See Picture, and -graph.]
   A picture or hieroglyph representing and expressing an idea.
   -- Pic`to*graph"ic, a.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pictograph
    n 1: a graphic character used in picture writing

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "pictograph":
   arrowhead, character, cuneiform, demotic character, determinative,
   grammalogue, hieratic symbol, hieroglyph, hieroglyphic,
   hieroglyphics, hiragana, ideogram, ideograph, kana, katakana,
   logogram, logograph, ogham, phonetic, phonetic symbol, pictogram,
   radical, rune, shorthand, wedge, word letter



The Free On-line Dictionary of Computing (30 December 2018):

pictogram
pictograph

    (Or "pictograph") A symbol which is a picture that
   represents an object or concept, e.g. a picture of an envelope
   used to represent an e-mail message.

   Pictograms are common in everyday life, e.g. signs in public
   places or roads, whereas the term "icon" is specific to
   interfaces on computers or other electronic devices.

   Pictograms are the most common kind of ideogram (symbols
   representing concepts), the other kind are not pictures but are
   conventions.

   (2014-07-30)