Time warp to many years ago that doesnāt seem all that long ago. 
Generous post @BubbaMc! Do you still use the ā>ā and ā<ā notation to indicate direction? I prefer to use ā/ā and ā\ā but typically only when notating a skip or jump for clarity of interpretation. For example, resurrecting Jingle Bells from your Harmony Central post of yore:
Jingle bells: mi mi mi mi mi mi mi > so < do > re > mi > fa fa fa etc.
I would typically notate as follows, two ways, one for myself (known melody), and a second to show others perhaps not sure what they are looking at, or when logging a tune Iāve transcribed that I wonāt necessarily fully remember by name when looking back over my notes.
Jingle bells: mi mi mi, mi mi mi, mi so do re mi. fa fa fa etc.
Jingle bells: mi mi mi, mi mi mi, mi / so \ do re mi. fa fa fa etc.
Anyone else doing something different? Is there a standard in use anywhere? I keep an ear training/transcription notebook, so this regards daily use with a pen or pencil.
The other thing I want to say is, folks have to understand that the solfege arose to answer the need for singable note names. This seems lost on many as the folks that answered you reveal. The ear training work is in the application.
Choose your poison? Singā¦
F#
#11
Fi
The first one is limited to a particular pitch, the second comprises a mouthful of syllables with a plosive in the middle, instead of oneā¦ Feeeeeeeā¦ for days, right?
And since I brought it up, here is a practical example of fi:
do re mi fi so la ti la so fi mi re do
ā¦key agnostic expression of lydian. Iām hearing and singing the line in my head (audiation). We need a musical alphabet, and then all of the chunking and whatnot can kick in as we speak our music conversationally. Happy Friday everyone!