The Homophone HA, used less often than AI, but equally significant: Click to ENLARGE:
This makes for entertaining reading, though possibly somewhat perplexing to some.
Let no-one be under any illusion that the Linear B homophone HA is any less significant than AI, regardless of the fact that it appears less often in Linear B texts on extant tablets. The homophone HA is not a diphthong! This homophone (HA) takes an enormous leap forward, specifically and exclusively in the Linear B syllabary, by explicitly expressing initial or even internal aspirated A’s. This incredible achievement eclipsed even the ancient Greek alphabet, which, need I remind you, was always written in CAPS (uppercase) alone, and hence, was utterly incapable of expressing any aspirated, let alone, unaspîrated vowels.
"What” I hear you indignantly explain, "Of course, they had aspirated and unaspirated vowels.” Yes, they did. But they never expressed them. Search any ancient alphabetical text in any dialect whatsoever for aspirated or unaspirated vowels, and you search in vain. Search Linear B, and voilà, staring us squarely in the face, is the aspirated A. Astonishing? Perhaps... perhaps not. But what this tells us unequivocally is that the ancient Greeks, even after the appearance of the alphabet, must have pronounced aspirated and unaspirated vowels, because in Mycenaean Greek, the aspirated A is squarely in the syllabary.
"But”, I hear you exclaim again, "If those Mycenaeans were so smart, why didn’t they also have a homophone for the aspirated E, which pops up all over the place in Medieval manuscripts in Classical Greek?” The answer is that Mycenaean Greek almost certainly had no use for the aspirated E, since all classical Greek words beginning with an aspirated E invariably begin with an aspirated A in Mycenaean Greek, as for instance, Mycenaean "hateros” versus classical Greek "heteros” (well, in most dialects, if not all). In other words, Mycenaean Greek grammar has no homophone for aspirated E, simply because they never used it, nor were they even aware of its existence.
Still, the fact remains that, at least where the aspirated A is concerned, Linear B was one step ahead of ancient alphabetical Greek. Both aspirated and unaspirated initial consonants were a feature introduced into written classical Greek alphabet only in the Middle Ages, when monks & other scribes began making extensive use of lower case letters. And, sure enough, along with the aspiration and non-aspiration of initial vowels (most often A, E & U), they also introduced all those other crazy accents we all must now memorize: the acute, grave, circumflex and susbscripted iota, just to make reading ancient Greek wretchedly more complicated. Don’t you wish they had left well enough alone? I often do. But this was not to be, since from the Middle Ages, and especially from the Renaissance on, almost all Occidental languages (Greek & French being two of the worst offenders) used accents liberally. Apparently only the Romans never bothered with accents ... but even here we cannot be sure, as they too wrote only in CAPS (uppercase). Even English, which is the Western language most adverse to accents, always uses them in borrowed words from French, Italian, Spanish etc. So you just can’t win.
Once again, amongst the ancient languages, at least as far as I know, Linear B alone was able to explicitly express the initial aspirated A, just as Linear B had the common sense to separate every word on the tablets from the next with a vertical line (|). After that, "something got lost in translation” (so to speak), and for at least 2 millennia, when all of a sudden everyone in the whole world went bonkers for accents.
Such are the vagaries of linguistics.