AFAIK there is no hard and fast rule about the usage of the words "keris" and "kris" on these forums. Over time many of us here have adapted "keris" for the Indo blades and "kris" for the Moro so that if Rick or Ian or some other regular uses the word "kris" i can be fairly sure what they mean without further description. But Alan is right that this is a very artificial device that can lead to confusion if it is not established in the discussion at hand. Obviously some of the most reknown writers on the Indo keris have used the spelling "kris" in the titles of their books, though you rarely see "keris" used for the Moro variety. I certainly have no problem with people using any of the spellings Alan named as long as they are clear about the variety they are speaking of.
As for your question about these blades, i am far more used to hearing this type of edge described as "pointy luks" which is probably another incorrect use of language since "luk" refers to the curves on Indo blades, which only adds to the confusion. But if you had asked about "pointy luks" i would have immediately understood your question. It seems we are constantly interchanging terms for the parts of Indo keris and Moro kris in a most inappropriate manner. Even when just discussing Indo keris it should be pointed out that the Javanese name for various parts are not the same as for the Malay peninsula area and they certainly don't apply to Moro kris.
The bottom line is understanding. Is our point understood? Do others know what part of the blade we are referring to or even what region or culture we are talking about? Sometimes it requires a few extra words to make our points clear.