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Which script was used to write Mycenaean Greek?

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Thematic map of Eurasia showing the approximate geographic distribution of Indo-European language families, each represented by a different color. Areas include Celtic in western Europe, Germanic in northern and central Europe, Romance in southwestern Europe, Slavic in eastern Europe and Russia, and Indo-Iranian languages in South Asia. Non-Indo-European language regions and areas of common bilingualism are also indicated. — Greek language Approximate locations of Indo-European languages in contemporary Eurasia.

Mycenaean Greek, the oldest known form of the Greek language, was written using a syllabic script known as Linear B.12

Adapted from an earlier, undeciphered script called Linear A, Linear B was utilized by the Mycenaean Greeks primarily for the economic administration and record-keeping of their palaces. The script consists of approximately 90 signs, each representing an open syllable (a consonant followed by a vowel or a single vowel). Because of this structure, the script was limited in its ability to represent final consonants or consonant clusters, often leading to ambiguous spellings.23

The script was famously deciphered in 1952 by Michael Ventris, confirming that the language recorded on the clay tablets was indeed an early dialect of Greek.23