•　　•

#spacer #layout element #vertical space

🖼️✕📝

#placeholder content #image placeholder #text placeholder #layout element #low-fidelity design #content block #UI kit

🧱🅰️〰️📝

#section divider #heading separator #content break #document structure #layout element #container header

🟦　🟦

#negative space #space between #layout element #object relationship

⚫️🗄️

#black header #top section #heading area #black top indicator #layout element #title bar