This alphabet was called the Abecedario, the original alphabet of the Catholicized Filipinos, which variously had either 28, 29, 31, or 32 letters. Until the first half of the 20th century, most Philippine languages were widely written in a variety of ways based on Spanish orthography.
Is it Alibata or baybayin?
Baybayin literally means “To spell”. Baybayin and Alibata are the same thing except that Alibata is the wrong term. It’s also been called Sulat Tagalog and other names but Alibata has stuck.