orthography

doubling

It appears that the duplication of letters served to indicate full/prolongued/special pronunciation:

consonant split

Two-consonant signs are famous for diverging into two readings:
𓂜𓈖 nulla => NO negation @PIE vs LA negation @ Semitic √𓈖=NILA
𓈖 𓄓 𓊃 𓅱 𓏏 𓈔||javelin| 𐎴𐎡𐏀𐎣 naizaka نیزه найза նիզակ nizak naýza … +++ NauZack™ ? N/L :
𓈖 𓄓 𓊃 𓅱 𓏏 𓈔||javelin| lance (wegen 𓈖𓄓=langue) λόγχη lónkhē

consonant combination

Similar to greek there seem to be inconsequential consonant combination rules (or sound shifts after writing) :

𐍃𐌺𐍉𐌷𐍃𐌻 Scheusal! (Schussel;)

μπλε = ble

*. 𓈖𓃀 bane
*. 𓈖𓆑 vν win
𓈖𓊪𓂋 ein Br… (𓈖 as proto-article)
𓈖𓊪𓂧𓌒𓌪 µButcher (𓈖 as proto-prefix em- en- …)
𓈖 𓎟 𓃀 𓏏 𓍮||basket|µKorbest NetzBasket 𓃀𓏏𓍮
𓈖𓌰𓅓 Mess?

𓈖 𓆑 𓏏 𓊡 𓏲||breath, wind|νφnt = nVent: wind ⇔ ƥnοė / νφ=v νβ=b νπ,μπλε=blue blow see greek! ++++
𓈖 𓊪 𓂋 𓏏 𓈀 𓏥||brim (of well), flat slab, basis|1-Brett ++?
𓎟 ⲛⲓⲃⲉⲛ = PAN 𓃀𓅱𓎟 𓀀 𓏥 𓁐 ⇔ 𓋞 Nubian Nobel Nippon 𓇳
𓆑 𓏏 𓏏 𓍢||lint|Fussel !! +++ DE

some advice to the Egyptians scribe: doubling an ambiguous syllable does not make it less ambiguous: nN or mM
𓈖 𓌳 𓄿 𓅱 𓏏 𓏛 = NEWS ⲛⲟⲩϥⲓ ϣⲉⲛⲛⲟⲩϥⲓ (schöne/good) news