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diff --git a/public/css/chapa_sigmoide.css b/public/css/chapa_sigmoide.css
index 19222b4..ef110da 100644
--- a/public/css/chapa_sigmoide.css
+++ b/public/css/chapa_sigmoide.css
@@ -220,6 +220,13 @@ button, input[type="submit"], input[type="reset"], input[type="button"]
 
 button svg {pointer-events:none;}
 
+header img
+{
+	width: min(50vw, 50vh);
+	margin-right: auto;
+	margin-left: auto;
+}
+
 div.ficha
 {
 	display: grid;
diff --git a/views/chapa-sigmoide/symbology.markdown b/views/chapa-sigmoide/symbology.markdown
index a9b23d2..a3b9b14 100644
--- a/views/chapa-sigmoide/symbology.markdown
+++ b/views/chapa-sigmoide/symbology.markdown
@@ -1 +1,19 @@
-# Simbologia
\ No newline at end of file
+# Simbologia
+
+A letra **C** simboliza a programação.
+
+Faz referência à linguagem C, uma linguagem de programação compilada, procedural, de propósito geral e de baixo nível amplamente conhecida e utilizada.
+
+O símbolo **∫** (integral) representa o cálculo e a matemática contínua.
+
+O formato do S estilizado também se assemelha ao de uma função sigmóide, um tipo de função matemática logística cujo valor varia de 0 à 1.
+
+![Função Sigmóide](/chapa-sigmoide/sigmoid-function.svg)
+
+A letra grega **Σ** (sigma) denota a operação de somatório e representa a matemática discreta.
+
+O formato da letra grega sigma lembra o da letra E, formando, com as demais letras, a sequência **CSE**, que remete a:
+
+ - **C**omputer **S**cienc**E**
+
+ - **C**hapa **S**igmóid**E**
\ No newline at end of file
diff --git a/views/chapa_sigmoide.erb b/views/chapa_sigmoide.erb
index a86dd8b..e63f135 100644
--- a/views/chapa_sigmoide.erb
+++ b/views/chapa_sigmoide.erb
@@ -1,19 +1,18 @@
+<!DOCTYPE html>
 <html>
 	<head>
 		<title>Chapa Sigmóide</title>
-
 		<meta name="viewport" content="width=device-width,initial-scale=1">
-
 		<link rel="stylesheet" type="text/css" href="/css/chapa_sigmoide.css">
-
 		<link href="https://fonts.googleapis.com/css2?family=Victor+Mono:wght@400;700&display=swap" rel="stylesheet">
+		<link rel="icon" href="/chapa-sigmoide/logo-circular.svg" type="image/svg+xml">
 	</head>
 
 	<body>
 		<header>
 			<nav>
+				<img src="/chapa-sigmoide/logo-retangular-sem-texto.svg">
 				<a href="/home">Início</a>
-
 				<a href="/chapa-sigmoide/readme.markdown">Chapa Sigmóide</a>
 			</nav>
 		</header>