The Wolfram Language used in Mathematica allows the user to omit the multiplication symbol, but requires square brackets to indicate the argument of a function; square brackets are not allowed for grouping of expressions.
ðə wˈʊlfɹæm lˈæŋɡwɪdʒ jˈuːzd ɪn mˌæθɪmˈæɾɪkə ɐlˈaʊz ðə jˈuːzɚ tʊ oʊmˈɪt ðə mˌʌltɪplɪkˈeɪʃən sˈɪmbəl, bˌʌt ɹᵻkwˈaɪɚz skwˈɛɹ bɹˈækɪts tʊ ˈɪndᵻkˌeɪt ðɪ ˈɑːɹɡjuːmənt əvə fˈʌŋkʃən; skwˈɛɹ bɹˈækɪts ɑːɹ nˌɑːt ɐlˈaʊd fɔːɹ ɡɹˈuːpɪŋ ʌv ɛkspɹˈɛʃənz.