三级结构三級結構 in English
Stroke order
Show the animation Stroke data from Make Me a Hanzi, derived from the Arphic PL fonts under the Arphic Public License.
Show the animation 
Stroke data from Make Me a Hanzi, derived from the Arphic PL fonts under the Arphic Public License.
Show the animation 
Stroke data from Make Me a Hanzi, derived from the Arphic PL fonts under the Arphic Public License.
Show the animation 
Stroke data from Make Me a Hanzi, derived from the Arphic PL fonts under the Arphic Public License.
How it used to be written
三
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Oracle bone script 商 -
Clerical script 東漢 - See all 12 forms
级
These are the forms of 級, the traditional character: 级 is a twentieth-century simplification, found in no ancient corpus.
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Chu manuscripts 戰國.楚 -
Clerical script 東漢 - See all 5 forms
结
These are the forms of 結, the traditional character: 结 is a twentieth-century simplification, found in no ancient corpus.
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Warring States script 戰國.齊 -
Clerical script 東漢 - See all 11 forms
构
These are the forms of 構, the traditional character: 构 is a twentieth-century simplification, found in no ancient corpus.
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Small seal script -
Clerical script 東漢 - See all 3 forms
Forms, sources and dates: the 字形演變 database of 小學堂, Academia Sinica, public domain (CC0).